Vestibule heater



June 26, 1928.

W. G. HARTWIG VESTIBULE HEATER Filed April 26, 1924 Patented June .26,19 2 8.

uN Eo srAT-ssf I 1,674,643 PATENT "OFFICE WILLIAM G. nanrwre, oroHIcAeo, rumors, Assrenon TO RAILWAY UTILITY COMPANY. or CHICAGO,ILLINOIS, A conroaa'rron or ILLINOIS.

I vEs'rIBULE HEATER. 1

TApPlication filed am, 19M. Serial No. 709,087.. I

My invent-ion relates to electric heaters-for use in the vestibules ofstreet carsv and thelike and has forjits object to provide a mountingandcasing for the electricheating elementsjemployed to maintain a propertemperature 1n the vestibules of cars which is sightly, relativelyinexpensive to manufacture, efficient indelivering heat to the car 'or.other enclosure in which it is, mounted and safe.

In the drawings accompanying and ing apart of this specification Fig.1'is an isometric View of a vestibule heater embodying my invention;Fig. 2 a verticalsection on the plane of the'line 2-2 of Fig. 1, partlybroken away to save space; Fig. 3 a trans: verse horizontal section onthecline- Fig. 2' and Fig. 4 a vertical section of a detail;

My invention is shown in connection with a pair of flat strip heatingelements of a kind found upon the market, abrief description of whichwill suffice for'the present pur-v pose. It comprises a zig-zag. orserpentine i resistor strip 5 embedded in insulating mate:

rial 6 and surrounded by asheetmetalsheath 7, theends of which are bentto-- 'gether and perforated as at 8 to form anattaching lug. The endsofthe-he-ating strip. or resistor 55 are soldered orvv otherwise, se-

cured. to terminals9, one of which is shown in Fig. 4 and which compriseeach a flat disklO embedded ininsulating material and I a screw socket11 which projects through an p opening 12 in the wall. of the sheath butis insulated therefrom. A- double-ended screw bolt 13 provided with anut 14 intermediate its ends is screwed into the socket and forms abinding post to which the end of the con- .40 nector 1.5 is secured by anut 16. A pair of such heating elements is preferably "mounted in eachvestibule heater casing upon upper and lower insulating supports 19 and20. These supports are attached by screws 21 to the base member 22 ofthecasingfas presently described. The supports 19, are

identical and T-shaped .in cross-section, the

cross member of'the T receiving at opposite ends thereof sheet metalbrackets 23 which are screwed to the'support at 24 and project upwardlytherefrom at 25. The heater elements are secured to these brackets byscrew bolts 26, each bracket being perforated to receive its screw boltand the latter provided with an insulator 27 which is formed form tionedperforation in the end of the heater element which it supports. 1 A micaor other.

insulating washer 30 surrounds the sleeve of the insulator and bearsagalnst' the outer side of the heater element. and the metal washer 1 31is interposed between the head;

The

of the screw and said *inica' washer. screw 26 llkGWlSG extendsthroughthe, per-.

forated end of the connector 15 above men-" tioned whichv bears upon-thebracket 25 against which it is tightly clamped by the,

screw bolt and nut 31. 'Thusthe heater elements are firmly supported at,their respective ends independently of the electric terminalsthereof.One of the two screws 24 by which each bracket 23 issupported may beusedas a bindingpost for connecting the corresponding lead wire tothebracket from which electric connection is made through the connector 15toth'e terminal 9."

As heretofore stated the'supports 19, 20. are secured to the base plate22 of the hous-,

ing. The edges of the base plate are bent rearwardly and with a flare asat, 32, Fig.3,

and the upper end of this base. plate is bent forwardly or provided withan extension 33 v for a purpose which will presently appear.

The upper endof the base plate is provided with a, hair of feet or.attaching lugs 34 provided-.with holes 35 for the reception of screws bywhich it may be attached to the anel in the vestibule. The lower end ofthe base plate is supported from the panel 'by means of a bracket 36,the upper end of which is spot-welded as at 37 to the base plate andwhich is bent rearwardly below the point of attachment as'at 38 and thenvertically at 39 to form a seat through which the attaching screws40 areinserted.v

At the lower end of the vertical portion the bracket is bent forwardlyas at 41 and bifurcated or notched at 42 to receive the pipe 43 throughwhich the-lead wires are drawn.

The end of the pipe is threaded and nuts 44,

45 on the threaded portion engage and clamp the edges of the bifurcatedportion 42 of the bracket. The brackets 34, 36 support the base plateaway from and parallel to the panel to which it isattached so that aircurrents may pass upwardly between the two and thusjutilize the heatabsorbed by the I base plate v and prevent its transmission to thesupportlng panel.

The casing or housing 46 is preferably of the shape indicated in Figs. 1and 3 comprising a front wall 47 and inclined or flaring side walls 48,which latter at their rearward edges fit upon the flaring flanges 32 ofthe base plate as best seen in Fig. 3. Beyond said flanges the edges ofthe side walls of the housing are bent outwardly as at 49 to formflanges which are pierced for screws for attachment to the supportingpanel independently of the base plate. In the preferred constructionshown the side walls are inwardly bent at 50 to form shoulders restingupon the front face of the base plate, These re entrant portions of theside walls are slit as at 51 to receive and brace the forwardlyprojecting baffle 33 which is attached to said base plate and fitssnugly atits edgesagainst the housing. Thehousing is provided with rowsof perforations 52, 53 above said 'balhe through which the heated airascendingbetween the base plate and the supportingpanel may escape tothe interior of the vestibule, thus materially contributing to theheating effect. The upper and lower lead wires 54, 55 connected to therespective heating elements are carried out through the piping 4:3, Theend walls 60, 61 of the casing may be formed of sheet-metal spot-weldedor otherwise secured" to the side walls thereof, the lowerend beingperforated as shown for the passage of the pipe or conduit 432 I claim:

1. A heater of the class described comprising a vertical perforatedcasing adapted to be attached to a vertical support, a base platetherein terminating short of the upper end of the casing, a heatingelement mounted on the base plate, brackets for at taching the baseplate to the support so formed and arranged as to support the base platefrom and spaced away from the support, there being openings in the upperand lower ends of the casing adapted to communicate with the spacebetween the base plate and support. 1

2. In a heater of the class described, a vertical casing adapted to beattached to a supporting panel, a base plate therein terminating shortof the upper end of the easing, a heating element mounted on the baseplate, brackets for supporting the base plate away from the panel onwhichthe heater is mounted, and a bathe projecting forwardlyfrom theupper end of the base plate, there being openings in the walls of thecasing.

above the ball-le andbelow the baseplate.

3. In a heater of the class described, a casing having perforated wallsand adapted to be secured to a vertical panel, a vertical base platewithin the casing terminating short of the upper end of the casing, abaflle extending forwardlyfroin the upper end of the base plate, aheating element mounted on the base plate, brackets for mounting thebase plate on the panel and spacing it therefrom, there beingperforations in the walls of the casing above the baffle and at thelower end of the casing, and means for at taching the casing to thepanel independently" ofthe base plate.

4. In a heater of the class described, a base plate, brackets formounting the base plate on an upright panel and spaci'ngit therefrom, acasing surrounding the base plate and formed. above and below withopenings communicating with the space behind the base plate, said baseplate terminating' short of the top wall of the casing, said casingformed with reentrant portions resting upon the face of the base plate,and flanges for attaching the casing to a support.

WILLIAM G. HARTWIG.

